whoever
The German word 'wer' is used to translate the English word 'whoever'. It is an indefinite pronoun that refers to a person without specifying who that person is. It can be used in questions, such as 'Wer ist das?' (Who is that?), or in statements, such as 'Wer auch immer kommt, ich werde da sein.' (Whoever comes, I will be there.).
Who is that?
This phrase is used to inquire about an individual's identity. 'Wer' is the German word for 'who', 'ist' stands for 'is', and 'das' means 'that'.
Who has opened the door?
This sentence is typically said when one wants to find out who performed the action of opening the door. 'Wer' means 'who', 'hat' is used to indicate past tense, 'die Tür' stands for 'the door', and 'geöffnet' is the past participle of 'open'.
Who knows the answer?
This is a common phrase that might be used in a classroom or discussion setting, when someone wants to know who possesses knowledge of a specific answer. 'Wer' translates to 'who', 'kennt' stands for 'knows', 'die Antwort' is 'the answer'.